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Presentation 5/25/2015 Australian Plants v Herbicides ‘What is most intriguing is that the greatest higher plant, species diversity is found on the most Phosphate impoverished soils on the south-western Australian sand plains and is known as the kwongan vegetation’ (Professor Hans Lambers) ‘In Australia there is actually very little data on pesticide use and environmental impact. This makes it difficult to judge how Australia is tracking against other countries, and how our flora and fauna are responding with continued exposure to these toxins’. (Croplife, Australia) Broad-spectrum pesticides are some of the cheapest chemicals in Australia costing only A$1.50 per hectare to apply in grain crops, making them an obvious choice. (Croplife, Australia) ‘There is no single list of banned chemicals, but several useful sources for information about restrictions on chemicals.’ (NICNAS, Australia) Dr. Mark Bundock Dr. Jason Stevens Professor Kingsley Dixon Unpredictable off- target effects of herbicides and adjuvants in bushland restoration Red/Green Kangaroo Paw 1 5/25/2015 Rationale Herbicides and adjuvants are routinely used to remove weeds. The main method of application is spraying a mixture of herbicides and adjuvants. Herbicides - good Agricultural knowledge base, but more limited when native systems are involved. Adjuvants - good knowledge base on their effects on herbicide uptake, but little information on phytotoxic effects in isolation. Objectives To separate the effects of herbicides and adjuvants on: Plant Growth: Germination Seedling emergence Growth, health and survival of seedlings Soil Environment: Persistence Nutrients Soil structure 2 5/25/2015 Study Species Anigozanthos manglesii Acacia pulchella Kunzea ericifolia Banksia grandis Austrostipa elegantissima Eucalyptus marginata Test Chemicals Name Common Name Use Agral 90 Nonyl phenol ethanoate Emulsifiers & surfactants Pulse wetter Polyether modified polysiloxane Wetter Wetter 1000 Alcohol Ethoxylate Wetter and spreader •Pre-emergence for broadleaf and grassy weeds Logran Triasulfuron •Post-emergence for broadleaf weeds. Metsulfuron Metsulfuron-methyl Selective control of broadleaf weeds. Targa Quizalofop-P-ethyl Post-emergence on grass weed. Fusilade Fluazifop-P-butyl Post-emergence for grass weeds Lontrel Clopyralid Post-emergence for broadleaf weeds Dalapon Sodium/Magnesium Dalapon Post-emergent for broadleaf weeds White - Adjuvants, Yellow - Herbicides 3 5/25/2015 Study Sites Mundaring Western Australia Perth Area Armadale © Google Earth Germination Hypothesis - Both herbicides and adjuvants will have a toxic effect on the off target plant species. Method Seeds were sown on sterile white sand in petri dishes. Each petri dish had 8ml of liquid added. Each chemical was added at 50%, 100% and 200% of field concentrations. 4 5/25/2015 Sample Results Agral applied to Kunzea ericifolia Lontrel applied to Banksia grandis 100 100 90 90 Agral 100 80 80 Lontrel 100 70 70 60 Control 60 Control 50 50 Germinants 40 40 % Germinants% 30 30 20 20 10 10 0 0 1 2 3 4 5 1 2 3 4 Time Time Chemicals applied at 100% Field application rates Agral is marketed as: Lontrel is marketed as: “““Increases wetting and improves “““For control of a wide range of spray coverage. It will not injure broadleaf weeds in crops, pastures, the most tender foliage if used as fallow land, forests and industrial directed ”””. situations ”””. Discussion-Germination Red is a decrease in germination, Green is an increase in germination from control All chemicals, adjuvants or herbicides had an affect on the test species. In most cases the result was a decrease in germination. Adjuvants often had a greater impact than the herbicides 5 5/25/2015 Seedling Emergence Hypothesis: All chemicals will reduce emergence, lower seedling survivability and depress health in the trial species. Method Ten species, ten treatments, two soils, two depths, five replicates. Emergence was recorded weekly for 12 weeks. Observations Emergence with subsequent death was recorded. Condition/health of seedlings was recorded. Both ex-situ and in-situ experiments carried out. Results Emergence Graphs showing percentage emergence of Eucalyptus marginata, treated with Pulse in grey sand, sown at different depths 100 90 This graph shows a 80 70 reduced emergence of 60 Average % Pulse Em 50 Sand Plain / 0.5 seedlings with increased Emergence 40 Average % Pulse Em sowing depth. 30 Sand Plain / 2 20 Here the chemical has a 10 0 greater effect on shallow 1 2 3 4 5 6 7 8910 Time seed banks. 6 5/25/2015 Results Emergence Graph showing percentage emergence of Kunzea ericifolia , treated with Pulse in Lateritic soil, sown at different depths 100 90 80 The graph shows a 70 reduced emergence of 60 Average % Pulse Ke 50 Lateritic / 0.5 seedlings with increased Emergence 40 Average % Pulse Ke Lateritic / 2 sowing depth. 30 20 In this instance the 10 0 chemical has a greater 1 2 3 4 5 6 7 8910 Time effect on deeper seed banks. Soil types Two soil types were tested in the study: Lateritic (Yarragil) Guildford sand Both are considered productive (by WA standards). 7 5/25/2015 Soil Types • Emergence was usually greater in sandy soils. • Emergence was usually greater for seeds sown at 2cm depth. • Herbicide had more significant effects in lateritic soil. Persistence Hypothesis: that chemicals will remain active in the soil for a period of weeks after application Method Ten species sown, ten treatments, two soils, five replicates. Seeds sown weekly for 4 weeks post spraying. Observation Emergence was recorded weekly for 12/16 weeks. Subsequent death was recorded. Condition/health of seedlings was recorded. 8 5/25/2015 Persistence Results Persistence of Agral on Banksia grandis in Persistence of Agral on Banksia grandis Lateritic soil in Sandy soil 100 100 90 90 80 80 70 70 60 60 Day 1 Emergence Day 1 50 Day 7 % 50 Day 7 Emergence % Day 14 40 40 Day 14 Day 21 30 30 Day 21 Control 20 Control 20 10 10 0 0 1 2 3 4 5 6 7 8 9 10111213141516 1 2 3 4 5 6 7 8 9101112 Time-Weeks Time-Weeks Initial emergence is delayed more in Lateritic than sandy soils. Overall, Banksia emergence is lower in sandy soils than Lateritic soils . Persistence in Lateritic soil is often less than in sandy soils. Persistence Summary Species Acacia Anigozanthos Austrostipa Banksia Eucalyptus Kunzea Ehrharta Euphorbia Pelargonium Lateritic Soil 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 Agral Dalapon Fusilade Logran Lontrel Metsulfuron Pulse Targa Wetter • Anigozanthos, Austrostipa and Kunzea are all strongly and persistently affected. • Some Chemicals start off with a positive effect but this becomes negative. • No correlation between seed size or type and effect. 9 5/25/2015 Discussion In all experiments, All chemicals negatively affected the growth and development of off-target plants, regardless of whether they were Adjuvants or Herbicides. Soil type had a strong bearing on the degree to which off- target plants were affected by the chemicals. Seed Burial depth altered the degree of effect a chemical had (but it was not consistent) . Being described as pre or post emergent or selective, did not preclude the chemical from affecting plants outside this description Take Home Message When chemical companies talk about off-target effects they are referring to crop species only. If you really want to know what the effect of herbicides and adjuvants will be, carry out trials! 10 5/25/2015 Australian Pesticides Use Over 8000 pesticide and veterinary products are registered for use in Australian agriculture, horticulture, livestock, forestry, commercial premises, parks, homes and gardens. More than 80 of these are prohibited 27 member countries of the European Union. This list includes 17 pesticides that are known, likely or probable carcinogens, 48 pesticides flagged as potential endocrine (hormone) disruptors. More than 20 are classified as either extremely or highly hazardous by the World Health Organisation. Three of the pesticides are subject to actions by International Conventions but are still used in Australia. (WWF, 2010) Australian Pesticides Use Nonyl phenol ethanoate (Agral®) is exempt from registration in Australia, whilst being banned by the EU. Atrazine®, an herbicide, is banned in 60 countries, but still currently registered for use in Australia. In Australia, if an adjuvant is pre-mixed with a herbicide, it does not need to be registered as it is not the ‘active’ ingredient. 11 5/25/2015 Acknowledgements Supervisors Dr. Jason Stevens (BGPA/UWA) Professor Kingsley Dixon (BGPA/UWA) Invaluable assistance/knowledge Bob Dixon (Manager Biodiversity Extension, BGPA) Steve Easton (Bushland Manager, BGPA) School of Plants Biology (University of Western Australia) Test Chemicals Name Common Name Chemical Composition Use Group Mode of action 600g/L nonyl phenol ethylene oxide Helps reduce the natural surface tension Agral 90 Non-ionic wetter emulsifiers & surfactants condensate of droplets . Produces very low surface tension, organosilicone based 1,020g/Lpolyether modified Pulse wetter Wetter resulting in stomatal flooding and uptake surfactant polysiloxane of pesticides. Improves the wetting and spreading Wetter 1000 Alcohol Ethoxylate Polyalkylene Oxide Wetter and spreader action of herbicides, by reducing surface tension of droplets Preemergence to control 3-(6-methoxy-4-methyl-1,3,5-triazin-2- broadleaf and grassy weeds; Inhibition of acetolactate synthase ALS Logran Triasulfuron yl)-1-[2-chloroethoxy)-phenysulfonyl]- postemergence to control B (acetohydoxyacid synthase AHAS) urea. broadleaf weeds. Methyl 2-(4-methoxy-6-methyl-1,3,5- inhibits amino acid production by selective control of broadleaf Metsulfuron Metsulfuron-methyl triazin-2-yl)amino carbamoyl inhibiting acetolactate synthase. weeds. B sulfamoyl)benzoate(1) Preventing cell division.. Ethyl (R)-2-[4-(6-chloroquinoxalin-2- Postemergence on grass Acetyl CoA carboxylase inhibitor; Targa Quizalofop-P-ethyl yloxy)phenoxy]propionate(1) weed. A inhibition of fatty acid biosynthesis.
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